The Milky Way galaxy is an example of a grand-design galaxy
a. True
b. False
Indicate whether the statement is true or false
False
RATIONALE: The Milky Way galaxy is neither flocculent nor a grand-design, but in between.
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Impedance: For a series ac circuit consisting of a resistance of 13.0 k?, a capacitance of 7.0 ?F, and an inductance of 35.0 H, what frequency is needed to minimize the impedance if the voltage amplitude is 110 V?
A. 0.010 kHz B. 0.064 kHz C. 12 kHz D. 2.1 kHz
A steel plate weighing 27 kN is hoisted by a cable sling that has a clevis at each end. The pins through the clevises are 22 mm in diameter. Each half of the cable is at an angle of 35° to the vertical. The average shear stress in each pin is approximately:
(A) 22 MPa
(B) 28 MPa
(C) 40 MPa
(D) 48 MPa
Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
A) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center. B) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster. C) Dark matter is present between galaxies in clusters, but not within individual galaxies. D) Dark matter is the dominant form of mass in both clusters and in individual galaxies.
A student wants to establish a standing wave on a wire 1.8 m long clamped at both ends. The wave speed is 540 m/s. What is the minimum frequency she should apply to set up standing waves?